L> Vapor PressureVapor PressureThe Macroscopic ViewThe vapor push of a fluid is the equilibrium pressure of a vaporabove its fluid (or solid); that is, the pressure of the vapor resultingfrom evaporation the a fluid (or solid) over a sample the the liquid (orsolid) in a close up door container. Examples:substancevapor pressure at 25oCdiethyl ether0.7 atmbromine0.3 atmethyl alcohol0.08 atmwater0.03 atmThe vapor push of a liquid varies through its temperature, asthe complying with graph shows for water. The line on the graph shows the boiling temperature for water.As the temperature the a liquid or solid increases its vapor pressurealso increases. Conversely, vapor press decreases together the temperaturedecreases.The vapor push of a liquid have the right to be measure in a variety of ways. A straightforward measurement requires injecting a small of the fluid intoa close up door flask associated to a manometer. Clickhere for an illustration.The microscopic ViewWhen a hard or a fluid evaporates to a gas in a closed container, themolecules can not escape.Some that the gas molecule will eventually strike the condensed step andcondense ago into it.When the rate of condensation of the gas becomes same to the rate of evaporationof the liquid or solid, the lot of gas, liquid and/or hard no longerchanges.The gas in the container is in equilibrium v the liquidor solid.Microscopic equilibrium in between gas and also liquid. Keep in mind that the price of evaporation the the fluid is equal to the rate of condensation the the gas.Microscopic equilibrium between gas and solid. Keep in mind that the rate of evaporation the the solid is same to the price of condensation that the gas.The push exerted by the gas in equilibrium through a hard or liquid ina closed container in ~ a given temperature is called the vapor pressure.Factors That influence Vapor PressureSurface Area: the surface ar area of the heavy or liquid incontact with the gas has actually no impact on the vapor pressure.Types the Molecules: the varieties of molecules that make up asolid or liquid recognize its vapor pressure. If the intermolecular forcesbetween molecule are:relatively strong, the vapor push will be relativelylow.relatively weak, the vapor press will be relativelyhigh. = C = O = Hethyl ether (C4H10O)Pvapor (25oC)= 520 torrThe reasonably weak dipole-dipole forces and London dispersion forces between molecules results in a much greater vapor pressure compared to ethyl alcohol.ethyl alcohol (C2H6O)Pvapor (25oC)= 75 torrAlthough dipole-dipole forces and also London dispersion forces also exist in between ethyl alcohol molecules, the solid hydrogen bonding interactions are responsible for the much lower vapor pressure contrasted to ethyl ether.Temperature: at a higher temperature, more molecules have enoughenergy come escape indigenous the liquid or solid. At a lower temperature, under molecules have actually sufficientenergy to escape from the liquid or solid.Microscopic equilibrium between gas and also liquid at short temperature.
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Keep in mind the small number of particles in the gas.Microscopic equilibrium between gas and liquid at high temperature. Keep in mind the big number of particles in the gas.